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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 19-5629; rev 0; 11/10 general description the max31722/max31723 digital thermometers and thermostats with an spi?/3-wire interface provide tem - perature readings that indicate the device temperature. no additional components are required; the devices are truly temperature-to-digital converters. temperature readings are communicated from the device over an spi interface or a 3-wire serial interface. the choice of interface is selectable by the user. for applications that require greater temperature resolution, the user can adjust the readout resolution from 9 to 12 bits. this is particularly useful in applications where thermal runaway conditions must be detected quickly. the thermostat has a dedicated open-drain output ( tout ). two thermostat operating modes, comparator and interrupt, control ther - mostat operation based on user-defined nonvolatile trip points (t high and t low ). both devices feature a 1.7v to 3.7v supply rail. applications networking equipment cellular base stations industrial equipment any thermally sensitive systems features s temperature measurements require no external components s measures temperatures from -55 n c to +125 n c s max31722 thermometer accuracy is 2.0 n c s max31723 thermometer accuracy is 0.5 n c s thermometer resolution is configurable from 9 to 12 bits (0.5 n c to 0.0625 n c resolution) s thermostat output with user-defined nonvolatile thresholds s data is read from/written to by spi (mode 0 and 2) or 3-wire serial interface s 1.7v to 3.7v power-supply range s available in 8-pin max ? package ordering information spi is a trademark of motorola, inc. max is a registered trademark of maxim integrated products, inc. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. functional diagram max31722 max31723 oversampling modulator configuration/ status register precision reference i/o control and input sense digital decimator sdi v dd v dd sclk sdo sermode gnd tout ce temperature register t high and t low registers thermostat comparator part temp range pin-package max31722 mua+ -55 n c to +125 n c 8 f max MAX31722MUA+t -55 n c to +125 n c 8 f max max31723 mua+ -55 n c to +125 n c 8 f max max31723mua+t -55 n c to +125 n c 8 f max
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 2 stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage range on v dd relative to gnd .............. -0.3v to +6.0v voltage range on any other pin relative to gnd ...-0.3v to +6.0v continuous power dissipation (t a = +70 n c) f max (derate 4.5mw/ n c above +70 n c) ...................... 362mw eeprom programming temperature range . ...-40 n c to +85 n c operating junction temperature range ......... -55 n c to +125 n c storage temperature range ............................ -55 n c to +125 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c recommended operating characteristics (t j = -55 n c to +125 n c, unless otherwise noted.) dc electrical characteristics (v dd = 1.7v to 3.7v, t j = -55 n c to +125 n c, unless otherwise noted.) absolute maximum ratings parameter symbol conditions min typ max units supply voltage v dd (note 1) 1.7 3.7 v input logic-high v ih (note 1) 0.7 x v dd v dd + 0.3 v input logic-low v il (note 1) -0.3 0.3 x v dd v parameter symbol conditions min typ max units max31722 thermometer error t err -40 n c to +85 n c q 2.0 n c -55 n c to +125 n c q 3.0 max31723 thermometer error t err 0 n c to +70 n c q 0.5 n c -55 n c to +125 n c q 2.0 resolution 9 12 bits conversion time t convt 9-bit conversions 25 ms 10-bit conversions 50 11-bit conversions 100 12-bit conversions 200 logic 0 output (sdo, tout ) v ol (note 2) 0.4 v logic 1 output (sdo) v oh (note 3) v dd - 0.4 v leakage current i l -1 +1 f a active current i cc active temperature conversions (note 4) 1150 f a communication only 100 eeprom writes (-40 n c to +85 n c) 1150 eeprom writes during active temperature conversions (-40 n c to +85 n c) 1200 shutdown current i cc1 2 f a
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 3 ac electrical characteristics: 3-wire interface (v dd = 1.7v to 3.7v, t j = -55 n c to +125 n c, unless otherwise noted.) (figures 1, 2) ac electrical characteristics: spi interface (v dd = 1.7v to 3.7v, t j = -55 n c to +125 n c, unless otherwise noted.) (figures 3, 4) ac electrical characteristics: eeprom (v dd = 1.7v to 3.7v, t j = -55 n c to +125 n c, unless otherwise noted.) note 1: all voltages are referenced to ground. currents entering the ic are specified positive, and currents exiting the ic are negative. note 2: logic 0 voltages are specified at a sink current of 3ma. note 3: logic 1 voltages are specified at a source current of 1ma. note 4: i cc specified with sclk = v dd and ce = gnd. note 5: measured at v ih = 0.7v x v dd or v il = 0.3 x v dd and 10ms maximum rise and fall times. note 6: measured with 50pf load. note 7: measured at v oh = 0.7 x v dd or v ol = 0.3 x v dd . measured from the 50% point of sclk to the v oh minimum of sdo. note 8: v dd must be > 2.0v during eeprom write cycles. parameter symbol conditions min typ max units data to sclk setup t dc (notes 5, 6) 35 ns sclk to data hold t cdh (notes 5, 6) 35 ns sclk to data valid t cdd (notes 5, 6, 7) 80 ns sclk low time t cl (note 6) 100 ns sclk high time t ch (note 6) 100 ns sclk frequency t clk (note 6) dc 5.0 mhz sclk rise and fall t r , t f 200 ns ce to sclk setup t cc (note 6) 400 ns sclk to ce hold t cch (note 6) 100 ns ce inactive time t cwh (note 6) 400 ns ce to output high-z t cdz (notes 5, 6) 40 ns parameter symbol conditions min typ max units eeprom write cycle time t wr -40 n c to +85 n c (note 8) 15 ms eeprom write endurance n eewr -40 n c p t a p +85 n c (note 8) 20,000 cycles t a = +25 n c (note 8) 80,000 parameter symbol conditions min typ max units data to sclk setup t dc (notes 5, 6) 35 ns sclk to data hold t cdh (notes 5, 6) 35 ns sclk to data valid t cdd (notes 5, 6, 7) 80 ns sclk low time t cl (note 6) 100 ns sclk high time t ch (note 6) 100 ns sclk frequency t clk (note 6) dc 5.0 mhz sclk rise and fall t r , t f 200 ns ce to sclk setup t cc (note 6) 400 ns sclk to ce hold t cch (note 6) 100 ns ce inactive time t cwh (note 6) 400 ns ce to output high-z t cdz (notes 5, 6) 40 ns sclk to output high-z t ccz (notes 5, 6) 40 ns
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 4 figure 1. timing diagram: 3-wire read data transfer figure 2. timing diagram: 3-wire write data transfer ce write address byte *i/o is sdi and sdo connected together. read data bit t cc t dc a0 a1 a7 d0 d1 t cdh t cdd t ccz t cdz t cdd sclk i/o* ce *i/o is sdi and sdo connected together. sclk i/o* t cc t cl t r t f t cch t cwh t dc t cdh t ch write address byte write data a0 a1 a7 d0
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 5 figure 3. timing diagram: spi read data transfer figure 4. timing diagram: spi write data transfer ce sclk sdi sdo t cc t cdh a7 a6 a0 d7 d6 d1 d0 t dc t cdd t cdd t cdz note: sclk can be either polarity , timing shown for cpol = 1. write address byte read data byte ce sclk sdi note: sclk can be either polarity , timing shown for cpol = 1. write address byte write data byte t cc t cdh t ch t r t f t cch t cwh t cdh a7 a6 a0 d7 d0 t dc t cl
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 6 typical operating characteristics (t a = +25c, unless otherwise noted.) temperature conversion error vs. reference temperature max31722/3 toc03 temperature (c) error (c) 80 60 20 40 0 -20 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 -40 12-bit temperature conversions v dd = 3.0v 3 -3 standby supply current vs. temperature max31722/3 toc02 temperature (c) i cc (a) 85 105 65 45 25 5 -15 -35 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 -55 125 v dd = 3.7v v dd = 3.0v v dd = 1.7v temperature conversion active supply current vs. temperature max31722/3 toc01 temperature (c) i cc (a) 105 85 65 45 25 5 -15 -35 200 400 600 800 1000 1200 0 -55 125 v dd = 3.7v v dd = 3.0v v dd = 1.7v
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 7 detailed description the max31722/max31723 are factory-calibrated tem - perature sensors that require no external components. the user can alter the configuration/status register to place the device in a continuous temperature conversion mode or into a one-shot conversion mode. in the continu - ous conversion mode, the devices continuously convert the temperature and store the result in the temperature register. as conversions are performed in the back - ground, reading the temperature register does not affect the conversion in progress. in the one-shot temperature conversion mode, the devices perform one temperature conversion, store the result in the temperature register, and then return to the shutdown state. this conversion mode is ideal for power-sensitive applications. the temperature conversion results have a default resolution of 9 bits. in applications where small incremental tem - perature changes are critical, the user can change the conversion resolution from 9 bits to 10, 11, or 12. this is accomplished by programming the configuration/status register. the devices can be configured as a thermostat, allow - ing for the tout pin to behave as an interrupt, trigger - ing when the programmed limits, t high and t low , are surpassed. the devices can communicate using either a serial peripheral interface (spi) or standard 3-wire inter - face. the user can select either communication standard through the sermode pin, connecting it to v dd for spi and to gnd for 3-wire. pin configuration pin description max 2 7 sermode ce 1 8 v dd tout + sdi sclk 3 6 sdo gnd 4 5 max31722 max31723 top view pin name function 1 tout thermostat output. open-drain output indicator for internal thermal alarm limits. 2 ce chip enable. must be asserted high for communication to take place for either the spi or 3-wire interfaces. 3 sclk serial-clock input. used to synchronize data movement on the serial interface for either spi or 3-wire interfaces. 4 gnd ground. ground connection. 5 sdo serial-data output. when spi communication is selected, the sdo pin is the serial-data output for the spi bus. when 3-wire communication is selected, this pin must be connected to the sdi pin. the sdi and sdo pins function as a single i/o pin when connected together. 6 sdi serial-data input. when spi communication is selected, the sdi pin is the serial-data input for the spi bus. when 3-wire communication is selected, this pin must be connected to the sdo pin. the sdi and sdo pins function as a single i/o pin when connected together. 7 sermode serial-interface mode input. this pin selects which interface is used. when connected to v dd , spi communication is selected. when connected to gnd, 3-wire communication is selected. 8 v dd supply voltage. power-supply input.
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 8 figure 5. temperature, t high , and t low register format measuring temperature the core of the devices functionality is its direct-to-digital temperature sensor. the devices measure temperature through the use of an on-chip temperature measure - ment technique with a -55 n c to +125 n c operating range. the devices power up in a power-conserving shutdown mode. after power-up, the devices can be placed in a continuous conversion mode or in a one-shot conver - sion mode. in the continuous conversion mode, the devices continuously compute the temperature and store the most recent result in the temperature register at addresses 01h (lsb) and 02h (msb). as conversions are performed in the background, reading the temperature register does not affect the conversion in progress. the temperature value is not updated until the spi or 3-wire interface is inactive. in other words, ce must be inactive for the temperature register to be updated with the most recent temperature conversion value. in the one-shot conversion mode, the devices perform one temperature conversion and then return to the shutdown mode, storing temperature in the temperature register. this conversion mode is ideal for power-sensitive applications. details on how to change the setting after power-up are contained in the programming section. the resolution of the temperature conversion is con - figurable (9, 10, 11, or 12 bits) with 9 bits reading the default state. this equates to a temperature resolution of 0.5 n c, 0.25 n c, 0.125 n c, or 0.0625 n c. following each conversion, thermal data is stored in the temperature register in twos complement format. the information can be retrieved over the spi or 3-wire interface with the address set to the temperature register, 01h (lsb) and then 02h (msb). table 1 describes the exact relation - ship of output data to measured temperature. table 1 assumes the devices are configured for 12-bit resolution. if the devices are configured in a lower resolution mode, those bits contain zeros. the data is transmitted serially over the digital interface, msb first for spi communica - tion and lsb first for 3-wire communication. the msb of the temperature register contains the sign (s) bit, denot - ing whether the temperature is positive or negative. table 1. 12-bit resolution temperature/data relationship s 2 6 2 5 2 4 2 3 2 2 2 1 2 0 02h msb (units = n c) lsb 2 -1 2 -2 2 -3 2 -4 0 0 0 0 01h temperature ( n c) digital output (binary) digital output (hex) +125 0111 1101 0000 0000 7d00 +25.0625 0001 1001 0001 0000 1910 +10.125 0000 1010 0010 0000 0a20 +0.5 0000 0000 1000 0000 0080 0 0000 0000 0000 0000 0000 -0.5 1111 1111 1000 0000 ff80 -10.125 1111 0101 1110 0000 f5e0 -25.0625 1110 0110 1111 0000 e6f0 -55 1100 1001 0000 0000 c900
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 9 thermostat the devices thermostat can be programmed to power up in either comparator mode or interrupt mode, which activate and deactivate the open-drain thermostat output ( tout ) based on user-programmable trip points (t high and t low ). the t high and t low registers contain celsius temperature values in twos complement format and are stored in eeprom memory. as such, the values are nonvolatile and can be programmed prior to install - ing the devices for stand-alone operation. the data format of the t high and t low registers is identical to that of the temperature register (figure 5). after every temperature conversion, the measurement is compared to the values stored in the t high and t low registers. the t high register is assigned to address locations 03h (lsb) and 04h (msb), and the t low reg - ister is assigned to address locations 05h (lsb) and 06h (msb). the tout output is updated based on the result of the comparison and the operating mode of the devices. the number of t high and t low bits used dur - ing the thermostat comparison is equal to the conversion resolution set by the r1 and r0 bits in the configuration/ status register. for example, if the resolution is 9 bits, only the nine msbs of t high and t low are used by the thermostat comparator. if the user does not wish to use the thermostat capa - bilities of the devices, the tout output should be left unconnected. note that if the thermostat is not used, the t high and t low registers can be used for general stor - age of system data. comparator mode when the thermostat is in comparator mode, tout can be programmed to operate with any amount of hysteresis. the tout output becomes active when the measured temperature exceeds the t high value. tout then stays active until the first time the temperature falls below the value stored in t low . putting the devices into shutdown mode does not clear tout in comparator mode. figure 6 illustrates thermostat comparator mode operation. interrupt mode in interrupt mode, the tout output first becomes active when the measured temperature exceeds the t high value. once activated, in continuous conversion mode tout can only be cleared by either putting the devices into shutdown mode or by reading from any register (configuration/status, temperature, t high , or t low ) on the devices. in one-shot mode, tout can only be cleared by reading from any register (configuration/ status, temperature, t high , or t low ) on the devices. figure 6. tout operation example t high t low temperature tout output?comparator mode tout output?interrupt mode inactive inactive active active conversions assumes a read has occured
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 10 in either mode, once tout has been deactivated, it is only reactivated when the measured temperature falls below the t low value. thus, this interrupt/clear pro - cess is cyclical between t high and t low events (i.e, t high , clear, t low , clear, t high , clear, t low , clear, etc.). figure 6 illustrates the thermostat interrupt mode operation. programming the area of interest in programming the devices is the configuration/status register. all programming is done through the spi or 3-wire communication interface by selecting the appropriate address of the desired register location. table 2 illustrates the addresses for the device registers. configuration/status register programming the configuration/status register is accessed in the devices with the 00h address for reads and the 80h address for writes. data is read from or written to the configuration/status register msb first for spi communi - cation and lsb first for 3-wire communication. table 3 illustrates the format of the register, describes the effect each bit has on device functionality, and provides the bits factory state. table 4 defines the resolution of the digital thermometer, based on the settings of the r1 and r0 bits. there is a direct trade-off between resolution and conversion time, table 2. register address structure table 3. configuration/status register bit descriptions read address (hex) write address (hex) active register 00 80 configuration/status 01 no access temperature lsb 02 no access temperature msb 03 83 t high lsb 04 84 t high msb 05 85 t low lsb 06 86 t low msb bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 memw nvb 1shot tm r1 r0 sd bit 7 this bit is always a value of 0. bit 6 memw: memory write bit. power-up state = 0. the user has read/write access to the memw bit, which is stored in the voltage memory. 0 = a write of the configuration/status register is stored in ram memory. 1 = a write of the configuration/status register is stored in eeprom. note: the status of this bit is ignored if a eeprom write occurs to the other nonvolatile registers, t high and t low . the nonvolatile bits of the configuration/status register are written if a eeprom write cycle occurs to the t high and t low registers. bit 5 nvb: nonvolatile memory busy flag. power-up state = 0 and is stored in volatile memory. 0 = indicates that the nonvolatile memory is not busy. 1 = indicates there is a write to a eeprom memory cell in progress. bit 4 1shot: one-shot temperature conversion bit. power-up state = 0 and is stored in volatile memory. 0 = disables 1shot mode. 1 = if the sd bit is 1 (continuous temperature conversions are not taking place), a 1 written to the 1shot bit causes the devices to perform one temperature conversion and store the results in the temperature register at addresses 01h (lsb) and 02h (msb). the bit clears itself to 0 upon completion of the temperature conver - sion. the user has read/write access to the 1shot bit, although writes to this bit are ignored if the sd bit is a 0 (continuous conversion mode). bit 3 tm: thermostat operating mode. factory power-up state = 0. the user has read/write access to the tm bit, which is stored in nonvolatile memory. 0 = the thermostat output is in comparator mode. 1 = the thermostat output is in interrupt mode.
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 11 as depicted in the ac electrical characteristics . the user has read/write access to the r1 and r0 bits, which are nonvolatile. see table 4. serial interface the devices offer the flexibility to choose between two serial interface modes. they can communicate with the spi interface or with a 3-wire interface. the interface method used is determined by the sermode pin. when sermode is connected to v dd , spi communication is selected. when sermode is connected to ground, 3-wire communication is selected. serial peripheral interface (spi) the spi is a synchronous bus for address and data transfer. the spi mode of serial communication is select - ed by connecting sermode to v dd . four pins are used for the spi: sdo (serial-data out), sdi (serial-data in), ce (chip enable), and sclk (serial clock). the devices are the slave device in an spi application, with the microcon - troller being the master. sdi and sdo are the serial-data input and output pins for the devices, respectively. the ce input is used to initiate and terminate a data transfer. sclk is used to synchronize data movement between the master (microcontroller) and the slave (ic) devices. the serial clock (sclk), which is generated by the microcontroller, is active only when ce is high and dur - ing address and data transfer to any device on the spi bus. the inactive clock polarity is programmable in some microcontrollers. the devices offer an important feature in that the level of the inactive clock is determined by sampling sclk when ce becomes active. therefore, either sclk polarity can be accommodated. input data (sdi) is latched on the internal strobe edge and output data (sdo) is shifted out on the shift edge (see table 5 and figure 7). there is one clock for each bit transferred. address and data bits are transferred in groups of eight, msb first. table 3. configuration/status register bit descriptions (continued) table 5. function table table 4. thermometer resolution configuration note: cpha bit polarity must be set to 1. * cpol is the clock polarity bit that is set in the control register of the microcontroller. ** sdo remains at high impedance until 8 bits of data are ready to be shifted out during a read. bit 2 r1: thermostat resolution bit 1. factory power-up state = 0 and is stored in nonvolatile memory. sets the con - version resolution (see table 4). bit 1 r0: thermostat resolution bit 0. factory power-up state = 0 and is stored in nonvolatile memory. sets the con - version resolution (see table 4). bit 0 sd: factory power-up state = 1. the user has read/write access to the sd bit, which is stored in nonvolatile memory. 0 = the devices continuously perform temperature conversions and store the last completed result in the tem - perature register. 1 = the conversion in progress is completed and stored, and then the devices revert to a low-power shutdown mode. the communication port remains active. r1 r0 thermometer resolution (bits) max conversion time (ms) 0 0 9 25 0 1 10 50 1 0 11 100 1 1 12 200 mode ce sclk sdi sdo disable reset low input disabled input disabled high impedance write high cpol = 1*, sclk rising data bit latch high impedance cpol = 0, sclk falling read high cpol = 1, sclk falling x next data bit shift** cpol = 0, sclk rising
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 12 figure 7. serial clock as a function of microcontroller clock polarity (cpol) address and data bytes address and data bytes are shifted msb first into the serial-data input (sdi) and out of the serial-data output (sdo). any transfer requires the address of the byte to specify a write or a read, followed by one or more bytes of data. data is transferred out of the sdo for a read opera - tion and into the sdi for a write operation. the address byte is always the first byte entered after ce is driven high. the msb (a7) of this byte determines if a read or write takes place. if a7 is 0, one or more read cycles occur. if a7 is 1, one or more write cycles occur. data transfers can occur 1 byte at a time in multiple-byte burst mode. after ce is driven high, an address is writ - ten to the devices. after the address, one or more data bytes can be written or read. for a single-byte transfer, 1 byte is read or written and then ce is driven low (see figures 8 and 9). for a multiple-byte transfer, however, multiple bytes can be read or written to the devices after the address has been written (see figure 10). a single-byte burst read/write sequentially points through all memory locations and loops from 7fh/ffh to 00h/80h. invalid memory addresses report an ffh value. 3-wire serial-data bus the 3-wire communication mode operates similarly to the spi mode. however, in 3-wire mode, there is one bidirectional i/o instead of separate data-in and data- out signals. the 3-wire consists of the i/o (sdi and sdo pins connected together), ce, and sclk pins. in 3-wire mode, each byte is shifted in lsb first, unlike spi mode where each byte is shifted in msb first. as is the case with the spi mode, an address byte is written to the devices followed by a single data byte or multiple data bytes. figure 11 illustrates a read and write cycle. figure 12 illustrates a multiple-byte burst transfer. in 3-wire mode, data is input on the rising edge of sclk and output on the falling edge of sclk. ce shift shift internal strobe internal strobe cpol = 1 cpol = 0 sclk ce sclk note: cpol is a bit th at is set in the microcontroller?s control register.
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 13 figure 9. spi single-byte write figure 10. spi multiple-byte burst transfer figure 8. spi single-byte read a7 ce sclk sdi sdo high-z a6 a5 a4 a3 a2 a1 a0 d7 d6 d5 d4 d3 d2 d1 d0 address byte ce sclk sdi write read sdi sdo data byte 0 data byte 0 data byte 1 data byte n data byte 1 data byte n address byte a7 ce sclk sdi sdo high-z d7 d6 d5 d4 d3 d2 d1 d0 a6 a5 a4 a3 a2 a1 a0
max31722/max31723 digital thermometers and thermostats with spi/3-wire interface 14 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. figure 12. 3-wire multiple-byte burst transfer figure 11. 3-wire single-byte transfer ce sclk i/o* a0 a1 a2 a3 a4 a5 a6 a7 d0 d1 d2 d3 d4 d5 d6 d7 *i/o is sdi and sdo connected together. ce sclk i/o* *i/o is sdi and sdo connected together. data byte 0 address byte data byte 1 data byte n package type package code outline no. land pattern no. 8 f max u8+1 21-0036 90-0092
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 15 ? 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. max31722/max31723 digital thermometers and thermostats with spi/3-wire interface revision history revision number revision date description pages changed 0 11/10 initial release

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